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Strain-induced significant increase in metal-insulator transition temperature in oxygen-deficient Fe oxide epitaxial thin filmsстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Hirai K., Kan D., Ichikawa N., Mibu K., Yoda Y., Andreeva M.A., Shimakawa Y.
- Журнал: Scientific reports
- Том: 5
- Номер: 7894
- Год издания: 2015
- Издательство: Nature Publishing Group
- Местоположение издательства: United Kingdom
- DOI: 10.1038/srep07894
- Аннотация: Oxygen coordination of transition metals is a key for functional properties of transition-metal oxides, because hybridization of transition-metal dand oxygen porbitals determines correlations between charges, spins and lattices. Strain often modifies the oxygen coordination environment and affects such correlations in the oxides, resulting in the emergence of unusual properties and, in some cases, fascinating behaviors. While these strain effects have been studied in many of the fully-oxygenated oxides, such as ABO3 perovskites, those in oxygen-deficient oxides consisting of various oxygen coordination environments like tetrahedra and pyramids as well as octahedra remain unexplored. Here we report on the discovery of a strain-induced significant increase, by 550 K, in the metal-insulator transition temperature of an oxygen-deficient Fe oxide epitaxial thin film. The observed transition at 620 K is ascribed to charge disproportionation of Fe3.661 into Fe41 and Fe31, associated with oxygen-vacancy ordering. The significant increase in the metal-insulator transition temperature, from 70 K in the bulk material, demonstrates that epitaxial growth of oxygen-deficient oxides under substrate-induced strain is a promising route for exploring novel functionality.
- Добавил в систему: Андреева Марина Алексеевна
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